Ametek PMT 40, Руководство пользователя

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User Manual
15
PROPOR RESET + RATE
CONTROLLER (Fig. 15)
To replace – same as Propor Reset
Controller.
To replace valve and filter – same as Proportional
+ Reset Controller.
To clean valve and filter – same as Propor
Reset Controller.
Alignment – with all components assembled into
instrument and supply air on, proceed as follows:
1. Set proportional band at 10%.
2. Open reset valve by turning fully clockwise to
stop.
3. Open rate valve by turning fully clockwise to
stop.
4. Set red pointer for full output.
5. Reduce supply pressure until mid-span
output is obtained.
6. Shut reset valve by turning full
counterclockwise (reset chamber now has
mid-span output pressure trapped inside
and controller will act like a proportional
controller).
7. Restore supply pressure to correct pressure.
8. Move red pointer with setting knob until
output pressure is at mid-span.
9. Turn proportional band to maximum setting.
Output pressure should not change more
than 10% of output span.
10. To obtain mid-span output pressure, loosen
locking nuts and move adjusting link to the
left or right. Tighten locking nuts.
11. Return band to 10%.
12. Repeat steps 8 thru 11 until output does not
vary more than 10% of output span when the
proportional band changes.
13. If red pointer does not coincide with black
pointer at mid-span output, hold red pointer
hub with 0.25” wrench and turn red pointer
until it coincides (apply torque near hub to
avoid bending pointer).
Figure 15
LOCKING NUTS
MTG. SCREW (2)
RESET VALVE
VALVE SCREW (4)
ADJUSTING LINK
FEEDBACK LINE
(TO RELAY)
FIGURE 15
RATE VALVE